User manual APOGEE AD-16X

[. . . ] 16-channel 24 bit, 192 kHz, A/D Converter User's Guide v2. 0 - January 2005 16-channel 24 bit, 192 kHz, A/D Converter v2. 0 - January 2005 User's Guide AD-16X ­ User's Guide APOGEE ELECTRONICS Warnings FCC warning This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case the user will be required to take whatever measures necessary to correct the interference at his own expense. Copyright Notice The Apogee AD-16X is a computer-based device, and as such contains and uses software in ROMs. [. . . ] Once a value is selected, it immediately becomes active, regardless if the LED is flashing to indicate that Setup mode has been enabled. If either the UV22HR, SOFT LIMIT or CAL mode parameters has been selected, pressing and holding either the PREV or NEXT button will allow the user to enter a corresponding Channel mode; it's now possible to cycle through channels 1-16 in order to make settings to individual channels. Parameters 3-7 are displayed in the Clock Window, as indicated at the top of this page. 3) 4) CLOCK SOURCE ­ This parameter determines the clock source of the AD-16X, and may be set to INTernal crystal or WC input. SAMPLE RATE - When the CLOCK SOURCE is set to INTernal , the Sample Rate display indicates the frequency of the internally generated clock, and may be set to any standard sample rates from 44. 1 to 192 kHz. When the CLOCK SOURCE is set to WC, the display indicates the sample rate of the AD-16X as a result of locking to the selected source; the sample rate cannot be set by the user. WC Ratio ­ This parameter deterWord Clock I/O Frequency mines the ratio between the word clock Input/Output frequency and the unit's 44. 1kHz 48kHz 88. 2kHz 96kHz sample rate. Figure 2 indicates the WC x1: 44. 1kHz 48kHz 88. 2kHz 96kHz resultant AD-16X sample rate given a WC Ratio specific WC Frequency Ratio setting Setting WC /2: 88. 2kHz 96kHz 176. 4kHz 192kHz and word clock input frequency. LikeWC/4: 176. 4kHz 192kHz wise, the word clock output frequency may be determined given a specific Resultant AD-16X Sample Rate WC Ratio setting and AD-16X sample rate. This parameter should be used Figure 2 to adjust the AD-16X word clock I/O to accommodate the requirements of specific digital systems. For example, to configure the AD-16X to lock to a 48kHz word clock input and run at a sample rate of 192kHz, set WC Ratio to WC fs/4. Lock indication ­ These LEDs indicate the Lock status of the AD-16X's C777 clock. When the Narrow LED and "Lock Exclamation Point" are lit, the AD-16X has locked to the selected CLOCK SOURCE in such a way to ensure the highest quality A-to-D conversion. If the Wide LED or only the upper section of the Lock Exclamation Point lights, the stability of the clock source is questionable, and should be verified. Thanks to SureLock, Apogee's intelligent clock continuity algorithm, the AD-16X will output a stable clock signal even if the selected CLOCK SOURCE is interrupted. When SureLock is engaged, the arrow section of the Lock exclamation point flashes to indicate a loss of the clock source, while the Narrow LED and blue point light solidly to indicate a stable clock output. 5) 176. 4kHz 176. 4kHz 192kHz 192kHz 6) "Lock Exclamation Point" 5 AD-16X ­ User's Guide APOGEE ELECTRONICS Navigating the Front Panel 8 continued 7 7) CAL mode indicator ­ This LED indicates that either Global or Channel CALibration mode is enabled, and that the analog to digital conversion level may be calibrated. Global CAL allows the calibration of all 16 channels simultaneously, while Channel CAL allows calibration of individual channels. Global CAL mode is enabled by scrolling through the 7 front panel parameters until the CAL LED flashes; "global Cal" will scroll across the Sample Rate display, followed by the digital output level of channel 1. Once enabled, all 16 analog input levels may be adjusted simultaineously by one of three operations: · Press and Hold UP to raise the analog input level and DOWN to lower the level. · Press and release UP or DOWN to modify the analog inputs +-. 01 dB; · Quickly tap UP or DOWN twice (think of a double mouse click) to modify the analog inputs +- 1. 0 dB. This double press function may be used to quickly jump from a "house" reference level to another reference level in precise 1 dB steps. Channel CAL mode is enabled by scrolling through the 7 front panel parameters until the CAL LED flashes, then pressing and holding either the PREV or NEXT buttons until "ch 1" scrolls across the Sample Rate display. Keeping in mind that Setup mode is always enabled while in Channel CAL mode, channel 1's analog output may be modified by the same operations described on the previous page. [. . . ] Apogee's AD8-IFC breakout cables can connect here to provide 8 XLR female connecters. Apogee's AD8-IFC breakout cables can connect here to provide 8 XLR female connecters. 3) OPTION - This slot is reserved for Apogee's X-Series Option cards, which provide additional digital output formats, such as FireWire or Digidesign HD. 4) ADAT ­ S/MUX These Toslink connections provide ADAT or S/MUX format optical outputs; the format employed is based on the AD-16X sample rate as indicated in Figure 4: also indicated are the connections used for each format. [. . . ]